Period-Luminosity-Colour Relation for Early-Type Contact Binaries

Abstract

This work describes the analysis of 64 early-type, massive contact or near-contact eclipsing systems from the Large Magellanic Cloud discovered by the OGLE-III survey. It presents the determination of the period-luminosity-colour relation followed by these objects, that is different from the one previously known for late-type W UMa stars. The relation for massive stars has a significantly steeper dependence on the colour, which is related to a much higher bolometric correction, however it is shallower in the period term. This leads to the conclusion, that the relation for the total population of main sequence contact binaries is non-linear. When studied separately, genuinely-contact and near-contact systems follow two slightly different relations.

8 pages, 9 figures, accepted to MNRAS

References in corpus (4)

• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• New Optical Reddening Maps of the Large and Small Magellanic Clouds
• Luminosity function of contact binaries based on the ASAS survey
• Temperature, gravity and bolometric correction scales for non-supergiant OB stars

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• Contact Binaries as Viable Distance Indicators: New, Competitive (V)JHKs Period-Luminosity Relations
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• On Zero Point Calibration of the Red Giant Branch Tip in the Magellanic Clouds
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• Search for Dormant Black Holes in Ellipsoidal Variables III. The OGLE BULGE Short-Period Sample
• Zwicky Transient Facility and Globular Clusters: the Period-Luminosity and Period-Luminosity-Color Relations for Late-Type Contact Binaries
• Towards early-type eclipsing binaries as extragalactic milestones: I. Physical parameters of OGLE-LMC-ECL-22270 and OGLE-LMC-ECL-06782
• Detailed evolutionary models of massive contact binaries: I. Model grids and synthetic populations for the Magellanic Clouds
• A Low Metallicity Massive Contact Binary Star System Candidate in WLM identified by Hubble and James Webb Space Telescope imaging
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